863 lines
20 KiB
C
863 lines
20 KiB
C
#include <arpa/inet.h>
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#include <errno.h>
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#include <libgen.h>
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#include <netdb.h>
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#include <resolv.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <unistd.h>
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#include <sys/wait.h>
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#include <netinet/in.h>
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#include <string.h>
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#define BUF_SIZE 8192
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#define READ 0
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#define WRITE 1
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#define DEFAULT_LOCAL_PORT 8080
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#define DEFAULT_REMOTE_PORT 8081
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#define DEFAULT_R_P 1024 /* 定义-r 时默认的转发CONNECT流的端口 */
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#define DEFAULT_M_S Lbxx: /* 定义-m 时默认的ML关键字符串(经判断无用，可舍弃) */
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#define SERVER_SOCKET_ERROR -1
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#define SERVER_SETSOCKOPT_ERROR -2
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#define SERVER_BIND_ERROR -3
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#define SERVER_LISTEN_ERROR -4
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#define CLIENT_SOCKET_ERROR -5
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#define CLIENT_RESOLVE_ERROR -6
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#define CLIENT_CONNECT_ERROR -7
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#define CREATE_PIPE_ERROR -8
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#define BROKEN_PIPE_ERROR -9
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#define HEADER_BUFFER_FULL -10
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#define BAD_HTTP_PROTOCOL -11
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#define MAX_HEADER_SIZE 8192
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#if defined(OS_ANDROID)
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#include <android/log.h>
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#define LOG(fmt...) __android_log_print(ANDROID_LOG_DEBUG,__FILE__,##fmt)
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#else
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#define LOG(fmt...) do { fprintf(stderr,"%s %s ",__DATE__,__TIME__); fprintf(stderr, ##fmt); } while(0)
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#endif
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char remote_host[128];
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int remote_port;
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int local_port;
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char r_h[128];
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int r_p;
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char m_s[128];
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int server_sock;
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int client_sock;
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int remote_sock;
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char * header_buffer ;
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enum
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{
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FLG_NONE = 0, /* 正常数据流不进行编解码 */
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R_C_DEC = 1, /* 读取客户端数据仅进行解码 */
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W_S_ENC = 2 /* 发送到服务端进行编码 */
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};
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static int io_flag; /* 网络io的一些标志位 */
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static int r_flag; /* 是否启用-r 匹配免流host直接转发CONNECT流量模式 */
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static int m_flag; /* 是否启用-m 关键字头匹配免流模式 */
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static int m_pid; /* 保存主进程id */
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void server_loop();
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void stop_server();
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void handle_client(int client_sock, struct sockaddr_in client_addr);
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void forward_header(int destination_sock);
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void forward_data(int source_sock, int destination_sock);
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void rewrite_header();
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int send_data(int socket,char * buffer,int len );
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int receive_data(int socket, char * buffer, int len);
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void hand_mproxy_info_req(int sock,char * header_buffer) ;
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void get_info(char * output);
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const char * get_work_mode() ;
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int create_connection() ;
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int _main(int argc, char *argv[]) ;
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ssize_t readLine(int fd, void *buffer, size_t n)
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{
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ssize_t numRead;
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size_t totRead;
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char *buf;
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char ch;
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if (n <= 0 || buffer == NULL) {
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errno = EINVAL;
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return -1;
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}
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buf = buffer;
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totRead = 0;
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for (;;) {
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numRead = receive_data(fd, &ch, 1);
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if (numRead == -1) {
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if (errno == EINTR)
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continue;
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else
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return -1; /* 未知错误 */
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} else if (numRead == 0) { /* EOF */
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if (totRead == 0) /* No bytes read; return 0 */
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return 0;
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else /* Some bytes read; add '\0' */
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break;
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} else {
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if (totRead < n - 1) { /* Discard > (n - 1) bytes */
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totRead++;
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*buf++ = ch;
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}
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if (ch == '\n')
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break;
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}
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}
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*buf = '\0';
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return totRead;
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}
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int read_header(int fd, void * buffer)
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{
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// bzero(header_buffer,sizeof(MAX_HEADER_SIZE));
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memset(header_buffer,0,MAX_HEADER_SIZE);
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char line_buffer[2048];
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char * base_ptr = header_buffer;
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for(;;)
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{
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memset(line_buffer,0,2048);
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int total_read = readLine(fd,line_buffer,2048);
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if(total_read <= 0)
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{
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return CLIENT_SOCKET_ERROR;
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}
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//防止header缓冲区蛮越界
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if(base_ptr + total_read - header_buffer <= MAX_HEADER_SIZE)
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{
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strncpy(base_ptr,line_buffer,total_read);
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base_ptr += total_read;
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} else
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{
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return HEADER_BUFFER_FULL;
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}
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//读到了空行，http头结束
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if(strcmp(line_buffer,"\r\n") == 0 || strcmp(line_buffer,"\n") == 0)
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{
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break;
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}
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}
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return 0;
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}
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void extract_server_path(const char * header,char * output)
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{
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char * p = strstr(header,"GET /");
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if(p) {
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char * p1 = strchr(p+4,' ');
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strncpy(output,p+4,(int)(p1 - p - 4) );
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}
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}
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int extract_host(const char * header)
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{
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if(!m_flag)
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{
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if(!r_flag)
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{
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char * _p = strstr(header,"CONNECT"); /* 在 CONNECT 方法中解析 隧道主机名称及端口号 */
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if(_p)
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{
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char * _p1 = strchr(_p,' ');
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char * _p2 = strchr(_p1 + 1,':');
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char * _p3 = strchr(_p1 + 1,' ');
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if(_p2)
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{
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char s_port[10];
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bzero(s_port,10);
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strncpy(remote_host,_p1+1,(int)(_p2 - _p1) - 1);
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strncpy(s_port,_p2+1,(int) (_p3 - _p2) -1);
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remote_port = atoi(s_port);
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} else
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{
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strncpy(remote_host,_p1+1,(int)(_p3 - _p1) -1);
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remote_port = 80;
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}
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return 0;
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}
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char * p = strstr(header,"Host:");
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if(!p)
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{
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return BAD_HTTP_PROTOCOL;
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}
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char * p1 = strchr(p,'\n');
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if(!p1)
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{
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return BAD_HTTP_PROTOCOL;
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}
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char * p2 = strchr(p + 5,':'); /* 5是指'Host:'的长度 */
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if(p2 && p2 < p1)
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{
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int p_len = (int)(p1 - p2 -1);
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char s_port[p_len];
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strncpy(s_port,p2+1,p_len);
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s_port[p_len] = '\0';
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remote_port = atoi(s_port);
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int h_len = (int)(p2 - p -5 -1 );
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strncpy(remote_host,p + 5 + 1 ,h_len); //Host:
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//assert h_len < 128;
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remote_host[h_len] = '\0';
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} else
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{
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int h_len = (int)(p1 - p - 5 -1 -1);
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strncpy(remote_host,p + 5 + 1,h_len);
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//assert h_len < 128;
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remote_host[h_len] = '\0';
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remote_port = 80;
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}
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} else
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{
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strncpy(remote_host, r_h, strlen(r_h));
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remote_port = r_p;
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}
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} else
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{
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char * __p = strstr(header,"CONNECT"); /* 在 CONNECT 方法中解析 隧道主机名称及端口号 */
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char * _p = strstr(header,m_s);
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//printf("Show: %s\n",_p);
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if(_p && __p)
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{
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char * _p1 = strchr(_p,' ');
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char * _p2 = strchr(_p1 + 1,':');
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char * _p3 = strchr(_p1 + 1,'\r');
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if(_p2)
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{
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char s_port[10];
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bzero(s_port,10);
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strncpy(remote_host,_p1+1,(int)(_p2 - _p1) - 1);
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strncpy(s_port,_p2+1,(int) (_p3 - _p2) -1);
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remote_port = atoi(s_port);
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} else
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{
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strncpy(remote_host,_p1+1,(int)(_p3 - _p1) -1);
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remote_port = 80;
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}
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return 0;
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}
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char * p = strstr(header,m_s);
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if(!p)
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{
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if(r_flag)
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{
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strncpy(remote_host, r_h, strlen(r_h));
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remote_port = r_p;
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return 0;
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}else
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{
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return BAD_HTTP_PROTOCOL;
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}
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}
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char * p1 = strchr(p,'\n');
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if(!p1)
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{
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return BAD_HTTP_PROTOCOL;
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}
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int m_l = strlen(m_s);
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char * p2 = strchr(p + m_l,':'); /* m_l是指类似自定义'Lbxx:'的长度 */
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if(p2 && p2 < p1)
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{
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int p_len = (int)(p1 - p2 -1);
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char s_port[p_len];
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strncpy(s_port,p2+1,p_len);
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s_port[p_len] = '\0';
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remote_port = atoi(s_port);
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int h_len = (int)(p2 - p - m_l -1 );
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strncpy(remote_host,p + m_l + 1 ,h_len); //Host:
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//assert h_len < 128;
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remote_host[h_len] = '\0';
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} else
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{
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int h_len = (int)(p1 - p - m_l -1 -1);
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strncpy(remote_host,p + m_l + 1,h_len);
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//assert h_len < 128;
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remote_host[h_len] = '\0';
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remote_port = 80;
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}
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}
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return 0;
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}
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/* 响应隧道连接请求 */
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int send_tunnel_ok(int client_sock)
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{
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char * resp = "HTTP/1.1 200 Connection Established\r\n\r\n";
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int len = strlen(resp);
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char buffer[len+1];
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strcpy(buffer,resp);
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if(send_data(client_sock,buffer,len) < 0)
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{
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perror("Send http tunnel response failed\n");
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return -1;
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}
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return 0;
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}
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//返回mproxy的运行基本信息
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void hand_mproxy_info_req(int sock, char * header) {
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char server_path[255] ;
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char response[8192];
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extract_server_path(header,server_path);
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LOG("server path:%s\n",server_path);
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char info_buf[1024];
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get_info(info_buf);
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sprintf(response,"HTTP/1.0 200 OK\nServer: MProxy/0.1\n\
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Content-type: text/html; charset=utf-8\n\n\
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<html><body>\
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<pre>%s</pre>\
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</body></html>\n",info_buf);
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write(sock,response,strlen(response));
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}
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/* 获取运行的基本信息输出到指定的缓冲区 */
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void get_info(char * output)
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{
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int pos = 0;
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char line_buffer[512];
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sprintf(line_buffer,"======= mproxy (v0.1) ========\n");
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int len = strlen(line_buffer);
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memcpy(output,line_buffer,len);
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pos += len ;
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sprintf(line_buffer,"%s\n",get_work_mode());
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len = strlen(line_buffer);
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memcpy(output + pos,line_buffer,len);
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pos += len;
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if(strlen(remote_host) > 0)
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{
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sprintf(line_buffer,"start server on %d and next hop is %s:%d\n",local_port,remote_host,remote_port);
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} else
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{
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sprintf(line_buffer,"start server on %d\n",local_port);
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}
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len = strlen(line_buffer);
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memcpy(output+ pos,line_buffer,len);
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pos += len ;
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output[pos] = '\0';
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}
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const char * get_work_mode()
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{
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if(strlen(remote_host) == 0)
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{
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if(!r_flag && !m_flag)
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{
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if(io_flag == FLG_NONE)
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{
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return "start as normal http proxy";
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} else if(io_flag == R_C_DEC)
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{
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return "start as remote forward proxy and do decode data when recevie data" ;
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}
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} else
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{
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return "start as -r or -m mode";
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}
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} else
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{
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if(io_flag == FLG_NONE)
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{
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return "start as remote forward proxy";
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} else if(io_flag == W_S_ENC)
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{
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return "start as forward proxy and do encode data when send data";
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}
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}
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return "unknow";
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}
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/* 处理客户端的连接 */
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void handle_client(int client_sock, struct sockaddr_in client_addr)
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{
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int is_http_tunnel = 0;
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if(strlen(remote_host) == 0) /* 未指定远端主机名称从http 请求 HOST 字段中获取 */
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{
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#ifdef DEBUG
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LOG(" ============ handle new client ============\n");
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LOG(">>>Header:%s\n",header_buffer);
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#endif
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if(read_header(client_sock,header_buffer) < 0)
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{
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LOG("Read Http header failed\n");
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return;
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} else
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{
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char * p = strstr(header_buffer,"CONNECT"); /* 判断是否是http 隧道请求 */
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if(p)
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{
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LOG("receive CONNECT request\n");
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is_http_tunnel = 1;
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}
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if(strstr(header_buffer,"GET /mproxy") >0 )
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{
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LOG("====== hand mproxy info request ====");
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//返回mproxy的运行基本信息
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hand_mproxy_info_req(client_sock,header_buffer);
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return;
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}
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if(extract_host(header_buffer) < 0)
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{
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LOG("Cannot extract host field,bad http protrotol");
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return;
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}
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LOG("Host:%s port: %d io_flag:%d\n",remote_host,remote_port,io_flag);
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}
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}
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if ((remote_sock = create_connection()) < 0) {
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LOG("Cannot connect to host [%s:%d]\n",remote_host,remote_port);
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return;
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}
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if (fork() == 0) { // 创建子进程用于从客户端转发数据到远端socket接口
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if(strlen(header_buffer) > 0 && !is_http_tunnel)
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{
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forward_header(remote_sock); //普通的http请求先转发header
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}
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forward_data(client_sock, remote_sock);
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exit(0);
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}
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if (fork() == 0) { // 创建子进程用于转发从远端socket接口过来的数据到客户端
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if(io_flag == W_S_ENC)
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{
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io_flag = R_C_DEC; //发送请求给服务端进行编码，读取服务端的响应则进行解码
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} else if (io_flag == R_C_DEC)
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{
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io_flag = W_S_ENC; //接收客户端请求进行解码，那么响应客户端请求需要编码
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}
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if(is_http_tunnel)
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{
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send_tunnel_ok(client_sock);
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}
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forward_data(remote_sock, client_sock);
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exit(0);
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}
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close(remote_sock);
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close(client_sock);
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}
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void forward_header(int destination_sock)
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{
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rewrite_header();
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#ifdef DEBUG
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LOG("================ The Forward HEAD =================");
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LOG("%s\n",header_buffer);
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#endif
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int len = strlen(header_buffer);
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send_data(destination_sock,header_buffer,len) ;
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}
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int send_data(int socket,char * buffer,int len)
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{
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if(io_flag == W_S_ENC)
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{
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int i;
|
||
for(i = 0; i < len ; i++)
|
||
{
|
||
buffer[i] ^= 1;
|
||
|
||
}
|
||
}
|
||
|
||
return send(socket,buffer,len,0);
|
||
}
|
||
|
||
int receive_data(int socket, char * buffer, int len)
|
||
{
|
||
int n = recv(socket, buffer, len, 0);
|
||
if(io_flag == R_C_DEC && n > 0)
|
||
{
|
||
int i;
|
||
for(i = 0; i< n; i++ )
|
||
{
|
||
buffer[i] ^= 1;
|
||
// printf("%d => %d\n",c,buffer[i]);
|
||
}
|
||
}
|
||
|
||
return n;
|
||
}
|
||
|
||
|
||
|
||
/* 代理中的完整URL转发前需改成 path 的形式 */
|
||
void rewrite_header()
|
||
{
|
||
char * p = strstr(header_buffer,"http://");
|
||
char * p0 = strchr(p,'\0');
|
||
char * p5 = strstr(header_buffer,"HTTP/"); /* "HTTP/" 是协议标识 如 "HTTP/1.1" */
|
||
int len = strlen(header_buffer);
|
||
if(p)
|
||
{
|
||
char * p1 = strchr(p + 7,'/');
|
||
if(p1 && (p5 > p1))
|
||
{
|
||
//转换url到 path
|
||
memcpy(p,p1,(int)(p0 -p1));
|
||
int l = len - (p1 - p) ;
|
||
header_buffer[l] = '\0';
|
||
|
||
|
||
} else
|
||
{
|
||
char * p2 = strchr(p,' '); //GET http://3g.sina.com.cn HTTP/1.1
|
||
|
||
// printf("%s\n",p2);
|
||
memcpy(p + 1,p2,(int)(p0-p2));
|
||
*p = '/'; //url 没有路径使用根
|
||
int l = len - (p2 - p ) + 1;
|
||
header_buffer[l] = '\0';
|
||
|
||
}
|
||
}
|
||
|
||
|
||
if(m_flag)
|
||
{
|
||
char * p6 = strstr(header_buffer,"Host:"); //...\r\nHost: miguvod.lovev.com:8080\r\nLbxx: tiny.cc\r\n....
|
||
char * p00 = strchr(p6,'\0'); // p6 p7 p8 p9 p00
|
||
char * p7 = strchr(p6,' ');
|
||
char * p8 = strstr(header_buffer,m_s);
|
||
char * p9 = strchr(p8,' ');
|
||
if(p6)
|
||
{
|
||
if(p8 && (p8 > p6))
|
||
{
|
||
memcpy(p7,p9,(int)(p00 -p9)); //以Lbxx的值覆盖Host的值，这要求Lbxx在模式中要紧跟在Host后面(仅对http)
|
||
int l = len - (p9 - p7) ;
|
||
header_buffer[l] = '\0';
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
|
||
void forward_data(int source_sock, int destination_sock) {
|
||
char buffer[BUF_SIZE];
|
||
int n;
|
||
|
||
while ((n = receive_data(source_sock, buffer, BUF_SIZE)) > 0)
|
||
{
|
||
|
||
send_data(destination_sock, buffer, n);
|
||
}
|
||
|
||
shutdown(destination_sock, SHUT_RDWR);
|
||
|
||
shutdown(source_sock, SHUT_RDWR);
|
||
}
|
||
|
||
|
||
|
||
int create_connection() {
|
||
struct sockaddr_in server_addr;
|
||
struct hostent *server;
|
||
int sock;
|
||
|
||
if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
|
||
return CLIENT_SOCKET_ERROR;
|
||
}
|
||
|
||
if ((server = gethostbyname(remote_host)) == NULL) {
|
||
errno = EFAULT;
|
||
return CLIENT_RESOLVE_ERROR;
|
||
}
|
||
LOG("======= forward request to remote host:%s port:%d ======= \n",remote_host,remote_port);
|
||
memset(&server_addr, 0, sizeof(server_addr));
|
||
server_addr.sin_family = AF_INET;
|
||
memcpy(&server_addr.sin_addr.s_addr, server->h_addr, server->h_length);
|
||
server_addr.sin_port = htons(remote_port);
|
||
|
||
if (connect(sock, (struct sockaddr *) &server_addr, sizeof(server_addr)) < 0) {
|
||
return CLIENT_CONNECT_ERROR;
|
||
}
|
||
|
||
return sock;
|
||
}
|
||
|
||
|
||
int create_server_socket(int port) {
|
||
int server_sock, optval;
|
||
struct sockaddr_in server_addr;
|
||
|
||
if ((server_sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
|
||
return SERVER_SOCKET_ERROR;
|
||
}
|
||
|
||
if (setsockopt(server_sock, SOL_SOCKET, SO_REUSEADDR, &optval, sizeof(optval)) < 0) {
|
||
return SERVER_SETSOCKOPT_ERROR;
|
||
}
|
||
|
||
memset(&server_addr, 0, sizeof(server_addr));
|
||
server_addr.sin_family = AF_INET;
|
||
server_addr.sin_port = htons(port);
|
||
server_addr.sin_addr.s_addr = INADDR_ANY;
|
||
|
||
if (bind(server_sock, (struct sockaddr*)&server_addr, sizeof(server_addr)) != 0) {
|
||
return SERVER_BIND_ERROR;
|
||
}
|
||
|
||
if (listen(server_sock, 20) < 0) {
|
||
return SERVER_LISTEN_ERROR;
|
||
}
|
||
|
||
return server_sock;
|
||
}
|
||
|
||
/* 处理僵尸进程 */
|
||
void sigchld_handler(int signal) {
|
||
while (waitpid(-1, NULL, WNOHANG) > 0);
|
||
}
|
||
|
||
void server_loop() {
|
||
struct sockaddr_in client_addr;
|
||
socklen_t addrlen = sizeof(client_addr);
|
||
|
||
while (1) {
|
||
client_sock = accept(server_sock, (struct sockaddr*)&client_addr, &addrlen);
|
||
|
||
if (fork() == 0) { // 创建子进程处理客户端连接请求
|
||
close(server_sock);
|
||
handle_client(client_sock, client_addr);
|
||
exit(0);
|
||
}
|
||
close(client_sock);
|
||
}
|
||
|
||
}
|
||
|
||
void stop_server()
|
||
{
|
||
kill(m_pid, SIGKILL);
|
||
}
|
||
|
||
void usage(void)
|
||
{
|
||
printf("Usage:\n");
|
||
printf(" -l <port number> specifyed local listen port \n");
|
||
printf(" -h <remote server and port> specifyed next hop server name to forward all trafic unhandled, prior to -m & -r\n");
|
||
printf(" -r <server and port> specifyed server name to forward 'HTTP'&'CONNECT' to, no matter what host is\n");
|
||
printf(" -m <ml key words> specifyed key words replaced & recognized as 'Host:' function, prior to -r\n");
|
||
printf(" -d <remote server and port> run as daemon\n");
|
||
printf(" -E encode data when forwarding data\n");
|
||
printf(" -D decode data when receiving data\n");
|
||
printf(" Notice:-h -r -m can not be used together.\n");
|
||
exit (8);
|
||
}
|
||
|
||
void start_server(int daemon)
|
||
{
|
||
//初始化全局变量
|
||
header_buffer = (char *) malloc(MAX_HEADER_SIZE);
|
||
|
||
signal(SIGCHLD, sigchld_handler); // 防止子进程变成僵尸进程
|
||
|
||
if ((server_sock = create_server_socket(local_port)) < 0)
|
||
{ // start server
|
||
LOG("Cannot run server on %d\n",local_port);
|
||
exit(server_sock);
|
||
}
|
||
|
||
if(daemon)
|
||
{
|
||
pid_t pid;
|
||
if((pid = fork()) == 0)
|
||
{
|
||
server_loop();
|
||
} else if (pid > 0 )
|
||
{
|
||
m_pid = pid;
|
||
LOG("mporxy pid is: [%d]\n",pid);
|
||
close(server_sock);
|
||
} else
|
||
{
|
||
LOG("Cannot daemonize\n");
|
||
exit(pid);
|
||
}
|
||
|
||
} else
|
||
{
|
||
server_loop();
|
||
}
|
||
|
||
}
|
||
|
||
int main(int argc, char *argv[])
|
||
{
|
||
return _main(argc,argv);
|
||
}
|
||
|
||
int _main(int argc, char *argv[])
|
||
{
|
||
local_port = DEFAULT_LOCAL_PORT;
|
||
io_flag = FLG_NONE;
|
||
r_flag = 0;
|
||
m_flag = 0;
|
||
//m_s = "DEFAULT_M_S";
|
||
int daemon = 0;
|
||
|
||
char info_buf[2048];
|
||
|
||
int opt;
|
||
char optstrs[] = ":l:h:r:m:dED";
|
||
char *p = NULL;
|
||
while(-1 != (opt = getopt(argc, argv, optstrs)))
|
||
{
|
||
switch(opt)
|
||
{
|
||
case 'l':
|
||
local_port = atoi(optarg);
|
||
break;
|
||
case 'h':
|
||
p = strchr(optarg, ':');
|
||
if(p)
|
||
{
|
||
strncpy(remote_host, optarg, p - optarg);
|
||
remote_port = atoi(p+1);
|
||
}
|
||
else
|
||
{
|
||
strncpy(remote_host, optarg, strlen(optarg));
|
||
remote_port = DEFAULT_REMOTE_PORT;
|
||
}
|
||
break;
|
||
case 'r':
|
||
p = strchr(optarg, ':');
|
||
if(p)
|
||
{
|
||
strncpy(r_h, optarg, p - optarg);
|
||
r_p = atoi(p+1);
|
||
}
|
||
else
|
||
{
|
||
strncpy(r_h, optarg, strlen(optarg));
|
||
r_p = DEFAULT_R_P;
|
||
}
|
||
printf("Your forward server is: %s:%d\n",r_h,r_p);
|
||
r_flag = 1;
|
||
break;
|
||
case 'm':
|
||
strncpy(m_s, optarg, strlen(optarg));
|
||
printf("Your sting is: %s\n",m_s);
|
||
m_flag = 1;
|
||
break;
|
||
case 'd':
|
||
daemon = 1;
|
||
break;
|
||
case 'E':
|
||
io_flag = W_S_ENC;
|
||
break;
|
||
case 'D':
|
||
io_flag = R_C_DEC;
|
||
break;
|
||
case ':':
|
||
printf("\nMissing argument after: -%c\n", optopt);
|
||
usage();
|
||
case '?':
|
||
printf("\nInvalid argument: %c\n", optopt);
|
||
default:
|
||
usage();
|
||
}
|
||
}
|
||
|
||
get_info(info_buf);
|
||
LOG("%s\n",info_buf);
|
||
start_server(daemon);
|
||
return 0;
|
||
|
||
}
|